Apparatus and averaging method for equalizing signals

a technology of equalizing signals and averaging methods, applied in the field of methods and apparatus for adaptive equalizing signals, can solve the problems of reducing costs and lowering power consumption, and achieve the effect of reducing power consumption
US6975678B1Active Publication Date: 2005-12-13NAT SEMICON CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NAT SEMICON CORP
Publication Date
2005-12-13

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Abstract

An adaptive equalizer system and method uses an averaging algorithm to adjust equalization and amplitude for a data signal. Two sampled data points, spanning a sampling window, are obtained from the equalized signal. The data points are evaluated to determine when a signal condition persists long enough to require equalization adjustment, as well as evaluating persistent conditions in the amplitude of the received data signal. By monitoring persistent conditions in the equalized signal, the average signal received by the equalizer is compensated. The bit resolution of the equalizer control and the amplitude control can be selected for a desired resolution in a system. The incoming data signal is used to generate the requisite timing signals for sampling and control such that high frequency clock circuits and PLL techniques are unnecessary resulting in lower power consumption and reduced costs.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates to a method and apparatus for adaptively equalizing a signal at high data rates. In particular, the present invention relates to a method and apparatus that includes an equalizer circuit that has an adjustable gain, and a combination of analog and digital circuits that are arranged to control the adjustable gain to provide equalization and amplitude control of a signal.BACKGROUND OF THE INVENTION

[0002] Data signals are degraded when transmitted over long lengths of cable. As the frequency of the data signal increases, the adverse effects on signal quality become more prevalent in the received signal. The data signal will become degraded in amplitude due to loss and phase dispersion from the cable.

[0003] Digital data signals consist of an infinite series of frequency components. High frequency digital data signals have very fast edges resulting in larger amplitudes in the high frequency components of the signal. Since the loss i...

Claims

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